1938606655 has 4 divisors (see below), whose sum is σ = 2326327992. Its totient is φ = 1550885320.

The previous prime is 1938606653. The next prime is 1938606673. The reversal of 1938606655 is 5566068391.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5566068391 = 13 ⋅428159107.

It is not a de Polignac number, because 1938606655 - 2¹ = 1938606653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1938606599 and 1938606608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938606653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193860661 + ... + 193860670.

It is an arithmetic number, because the mean of its divisors is an integer number (581581998).

Almost surely, 2^1938606655 is an apocalyptic number.

1938606655 is a deficient number, since it is larger than the sum of its proper divisors (387721337).

1938606655 is an equidigital number, since it uses as much as digits as its factorization.

1938606655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387721336.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 1938606655 is about 44029.6111157026. The cubic root of 1938606655 is about 1246.8950468654.

The spelling of 1938606655 in words is "one billion, nine hundred thirty-eight million, six hundred six thousand, six hundred fifty-five".